Ok ladies help (but don’t judge)

Ok so I know men look at other attractive women. But what about staring....? It does hurt me a little when my man looks at another women, but when he stares it hits me even harder and breaks my heart. The other day I was out bowling with my family, and some girl that was next to our lane was trying to show off in front of everyone, my boyfriend kept staring at her, and I don’t mean just one look, every time he went up to bowl it was her turn as well and he stared at her when she was spinning around after she did good, and then every time I went to talk to him I would look up at hi to begin a conversation and he was still staring at her, so yes this hurt my heart. I told him to please stop and when I said that it made me tear up I had to walk away and go to the bathroom because I didn’t want to cry in front of everyone... I’ve been pretty insecure all my life, and I have had anxiety since I was a little girl and it just makes me feel like I’m not enough, just makes my heart sink really badly when he STARES... I just think that’s wrong... so is there any ideas on how I can stop feeling like this, it bothers me, he knows but clearly can’t stop himself, trust me I’ve been with him 5 years, and I’ve told him it has bothered me after a year of being together... sorry for this being so long I just need advice to feel better about myself...